Big Bang Theory plot hole: Raj Koothrappali should have died in season 4 - here's why

THE BIG BANG THEORY may be over after 12 seasons on CBS but it hasn't stopped fans going back and rewatching the entire series. However, one fan has now picked on a huge plot hole surrounding Raj Koothrappali.

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Raj Koothrappali (played by Kunal Nayyar) quickly became a Big Bang Theory fan favourite following his introduction in the CBS pilot. So much so, he went onto appear in every single episode of the Golden Globe-winning sitcom alongside Sheldon Cooper (Jim Parsons), Howard Wolowitz (Simon Helberg) and Leonard Hofstadter (Johnny Galecki). However, a scene involving Raj and Sheldon from season four suggests he perhaps shouldn't have.

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"However, this gas is far more dangerous and is harmful to the human body at as low a concentration as 20 parts per million (ppm), can cause permanent damage at 100ppm and is fatal after two breaths at 500ppm.

"So for Raj (and his bird) to be completely unharmed in a high concentration of H2S (noted by the fire) is impossible."